Reservoir rocks for petroleum

Azizi Myrie March 23,2023

Containing granules the size of sand Colors that are often pale beige to tan but can also be dark brown to rusty red. Porosity and permeability are the main factors of reservoir rocks, in sandstone ranging from 10% to 30%. Sorting is a major factor in determining intergranular porosity (primary porosity).

A crucial characteristic of a reservoir rock is porosity. Nevertheless, permeability is the essential characteristic for it to be an effective reservoir rock. Both permeability and porosity are geometric characteristics of rocks that result from their lithologic (compositional) origin. The age of the rock is less important when discussing reservoir rocks than its physical composition and textural attributes (geometric elements like the sizes and shapes of the component grains and how they are packed).

In actuality, sandstones are home to the great bulk of the massive oilfields and tremendous oil output. Sandstones frequently have very high primary and secondary permeability values. For instance, the bulk of the oil and gas produced in Russia comes from clastic reservoir rocks. Moreover, American production has made substantial use of clastic reservoir rocks. There are a few notable exceptions, though. To give two examples, the Permian Basin in southwestern America and the vast oilfields in the Middle East are both carbonate (limestone) reserves.

Picture above represents the the sandstone oil reservoirs in Russia.

The original sandstone reservoir's quality depends on the location of the material's source, how it was deposited, and the surrounding conditions. Sandstone reservoirs typically have a thickness of 25 meters, are linear and lenticular in space, and cover an area of fewer than 250 km2. They range in age from the Pliocene, which is the youngest, to the Cambrian, which is the oldest (in Algeria) (Caspian region in Ukraine). Two-thirds of the sandstone reservoirs in the USA date back to the Cenozoic era.

References

http://www.dnr.louisiana.gov/assets/TAD/education/BGBB/4/rocks.html#:~:text=Answer%3A%20Dolomites%20are%20normally%20less,Voids%20that%20hydrocarbons%20can%20fill. www.dnr.louisiana.gov/assets/TAD/education/BGBB/4/rocks.html#:~:text=Answer%3A%20Dolomites%20are%20normally%20less,voids%20that%20hydrocarbons%20can%20fill.

Hindawi, et al. “Overview of Lower Cretaceous Achimov Formation: Physical Properties and Their Distribution Pattern in West Siberian Basin, Russia.” Overview of Lower Cretaceous Achimov Formation: Physical Properties and Their Distribution Pattern in West Siberian Basin, Russia, 8 Apr. 2021, https://doi.org/10.1155/2021/5560117.

“Reservoir Rocks.” PETROLEUM GEOLOGY, petgeo.weebly.com/reservoirrocks.html.